吸气式高超声速飞行器通气模型测力试验技术研究

Due to the limitation of the method of internal drag measurement, the accuracy of traditional aerodynamic experiments of force test with ducted models (TFTDM) is unable to meet the demands of airframe-propulsion integrated design and aerodynamic performance estimation for air-breathing hypersonic vehicles at Ma _∞ > 4.0. To solve this problem and ensure the aerodynamic accuracy experiments meet the demands of hypersonic vehicles development, the feasibility of introducing the internal drag measurement with the balance into TFTDM is explored firstly. After that, a new technique of force direct-test with ducted models (FDTDM) is proposed from improving the experimental method of TFTDM, to avoid the problem of internal drag measurement, which principle is the balance measurement of aerodynamic forces acting on the external component (airframe control volume) of ducted models with sting-supported model. A verification test is conducted and the accuracy of the technique is estimated. The results indicate that, due to cutting down the testing link of internal drag measurement, the accuracy of FDTDM is very high with the errors of drag coefficients less than 2% at [Ma∞]=6 and far below that of TFTDM. FDTDM has many advantages, such as high accuracy, simpler model structure, low technical complexity, large possibility of spread and application etc..